from django.http import HttpResponse, Http404, HttpResponseRedirect
from django.shortcuts import render, get_object_or_404
from django.template import loader
from .models import Question, Choice
from django.urls import reverse
from django.db.models import F
from django.views import generic
from django.utils import timezone
# Create your views here.

class IndexView(generic.ListView):
    template_name = 'polls/index.html'
    context_object_name = 'last_question_list'

    def get_queryset(self):
        return Question.objects.filter(pub_date__lte=timezone.now()).order_by("-pub_date")[:5]


class DetailView(generic.DetailView):
    model = Question
    template_name = 'polls/detail.html'

    def get_queryset(self):
        return Question.objects.filter(pub_date__lte=timezone.now())

class ResultsView(generic.DetailView):
    model = Question
    template_name = 'polls/results.html'
def index(request):
    lastest_question_list = Question.objects.order_by("-pub_date")[:5]
    #output = ','.join([q.question_text for q in lastest_question_list])

    #return HttpResponse(output)

   # template = loader.get_template("polls/index.html")
   # context = {
    #    "lasted_question_list": lastest_question_list
   # }
   # return HttpResponse(template.reder(context, request))

    context = {
        "last_question_list": lastest_question_list
    }
    return render(request, "polls/index.html", context)
def bio(request, username):
    return HttpResponse("Hello, %s" % username)


def num(request, num):
    return HttpResponse("number is %s" % num)


def bio2(request, username):
    return HttpResponse("bio2's username=%s" % username)


def detail(request, question_id):
    try:
        question = Question.objects.get(pk=question_id)
    except Question.DoesNotExist:
        raise Http404("您查找的这个问题并不存在，请确认您传入的问题编号是否正确")
    return render(request, "polls/detail.html", {"question": question})

def results(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    return render(request, 'polls/results.html', {'question': question})

def vote(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST['choice'])
    except(KeyError, Choice.DoesNotExist):
        return render(request, 'polls/detail.html', {
            'question': question,
            'error_message': "您投票的选项不存在或不正确"})
    else:

        selected_choice.votes = F('votes') + 1
        selected_choice.save()



        return HttpResponseRedirect(reverse('polls:results', args=(question.id, )))